In Which of the Following Ways Does the Safe Minimum

In which of the following ways does the safe minimum standard (SMS) approach to sustainability does not invalidate the standard economics approach to resource assessment and management?

A) SMS narrows the applicability of the standard economics conception of
sustainability.
B) Social opportunity costs could be assessed by using standard cost-benefit
analysis.
C) The SMS approach adheres to the notion of limits in substitution possibilities
between human and natural capital.
D) Both a and b .
E) Both a and c .